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    Unless to speak, you should remain silent at the conference. A. invited B. invite C. being invited D. having invited 【查看更多】

     

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    Unless _____ to speak, you should remain silent at the conference.

    A．invited         B．invite        C．being invited         D．having invited

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    Unless ________ to speak, you should remain silent at the conference．

    [　　]

    A．invited

    B．invite

    C．being invited

    D．having invited

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